Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c85d1d7aa8bdb50…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 13:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5089741736551cfaf922c2380e0f46a SHA-1: b5701526e1e4c58cff60f929ea3ebce031fe10a4 SHA-256: 0c85d1d7aa8bdb503dc1c72d022a9f790d032f56d86a24312d016bba89c15409
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

The sample is a PDF document that exhibits characteristics of a credential phishing lure, specifically targeting multi-factor authentication or one-time codes. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, which likely serve as landing pages for the phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://babyshelter.net/assets/upload/files/borisegu.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/75130547872.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1re49ao0fj0uagrsr3b7hr1i9s/50466019445.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/pigejejuke.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/musaxefafow.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/magebubobubusosuguzubevo.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/domorarinipofitikunisemax.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9373801c5ef233a5891774e41f3844bb/didoje.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/josuwuvezisogisikamis.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/winodejevutofo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/283214054e76504b8373da705237c5ce/seluxateru.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef619722e---16845823458.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ed17e972---bazeratofepevirepoworu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/vimazodogupudoletekum.pdfIn PDF document text
    • http://strandedtattoo.info/file/dokavenibelubikidazetinis.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5d740cd---2935224296.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/pekozonizonevezej.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nanejofope.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/85104691588.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xuvofapobidugebeful.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbb2dc789---wutixujipoluwi.pdfIn PDF document text
    • https://ms01bet.net/contents/files/mapojojeponopejejunapizu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/regefuletajitukizix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+photos+to+pc+via+bluetoothPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 17772 bytes
SHA-256: a67dbf4001372cb900671cf6442b89a654c6f71c8205c0a9c0d961706a2f73a1
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10892 bytes
SHA-256: 2a5dcd09aaea23411124ac93353b854e2a3a8ecbcc72b310573a38ff7b58cdf0
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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